diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 35cb319..780f1d1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,6 +16,7 @@ jobs:
           - batch
           - pool
           - syscall
+          - cosched
 
     steps:
     - uses: actions/checkout@v2
diff --git a/apps.c b/apps.c
index c889fd5..212fa83 100644
--- a/apps.c
+++ b/apps.c
@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 
+#include "sched.h"
 #include "usyscall.h"
 #include "pool.h"
 
@@ -15,6 +16,8 @@ static int g_retcode;
         X(retcode) \
         X(pooltest) \
         X(syscalltest) \
+        X(coapp) \
+        X(cosched) \
 
 #define DECLARE(X) static int X(int, char *[]);
 APPS_X(DECLARE)
@@ -52,6 +55,51 @@ static int retcode(int argc, char *argv[]) {
 	return 0;
 }
 
+struct coapp_ctx {
+        int cnt;
+} ctxarray[16];
+struct pool ctxpool = POOL_INITIALIZER_ARRAY(ctxarray);
+
+static void coapp_task(void *_ctx) {
+        struct coapp_ctx *ctx = _ctx;
+
+        printf("%16s id %d cnt %d\n", __func__, 1 + ctx - ctxarray, ctx->cnt);
+
+        if (0 < ctx->cnt) {
+                sched_cont(coapp_task, ctx, 2);
+        }
+
+        --ctx->cnt;
+}
+
+static void coapp_rt(void *_ctx) {
+        struct coapp_ctx *ctx = _ctx;
+
+        printf("%16s id %d cnt %d\n", __func__, 1 + ctx - ctxarray, ctx->cnt);
+
+        sched_time_elapsed(1);
+
+        if (0 < ctx->cnt) {
+                sched_cont(coapp_rt, ctx, 0);
+        }
+
+        --ctx->cnt;
+}
+
+static int coapp(int argc, char* argv[]) {
+        int entry_id = atoi(argv[1]) - 1;
+
+        struct coapp_ctx *ctx = pool_alloc(&ctxpool);
+        ctx->cnt = atoi(argv[2]);
+
+        void (*entries[])(void*) = { coapp_task, coapp_rt };
+        sched_new(entries[entry_id], ctx, atoi(argv[3]), atoi(argv[4]));
+}
+
+static int cosched(int argc, char* argv[]) {
+        sched_run(atoi(argv[1]));
+}
+
 static int exec(int argc, char *argv[]) {
 	const struct app *app = NULL;
 	for (int i = 0; i < ARRAY_SIZE(app_list); ++i) {
@@ -102,12 +150,12 @@ int shell(int argc, char *argv[]) {
 		char *stcmd;
 		char *cmd = strtok_r(line, comsep, &stcmd);
 		while (cmd) {
-			const char *argsep = " ";
+			const char *argsep = " \t";
 			char *starg;
 			char *arg = strtok_r(cmd, argsep, &starg);
 			char *argv[256];
 			int argc = 0;
-			while (arg) {
+			while (arg && arg[0] != '#') {
 				argv[argc++] = arg;
 				arg = strtok_r(NULL, argsep, &starg);
 			}
diff --git a/sched.c b/sched.c
new file mode 100644
index 0000000..59ff079
--- /dev/null
+++ b/sched.c
@@ -0,0 +1,29 @@
+#include <limits.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "sched.h"
+#include "pool.h"
+
+static int time;
+
+void sched_new(void (*entrypoint)(void *aspace),
+		void *aspace,
+		int priority,
+		int deadline) {
+
+}
+
+void sched_cont(void (*entrypoint)(void *aspace),
+		void *aspace,
+		int timeout) {
+
+}
+
+void sched_time_elapsed(unsigned amount) {
+	time += amount;
+
+}
+
+void sched_run(enum policy policy) {
+}
diff --git a/sched.h b/sched.h
new file mode 100644
index 0000000..462dbec
--- /dev/null
+++ b/sched.h
@@ -0,0 +1,33 @@
+#pragma once
+
+enum policy {
+	// first-in, first-out; run tasks in order of their arrival
+	POLICY_FIFO,
+
+	// highest priority task (highest priority value) should be executed
+	// first. Use round-robin for processes with same priority
+	// (task from 1st process, from 2nd, ... Nth, 1st, 2nd, ...)
+	POLICY_PRIO,
+
+	// consider deadline, execute process with Earliest Deadline First.
+	// Fallback to priority policy if deadlines are equal
+	POLICY_DEADLINE,
+};
+
+// Add new task
+extern void sched_new(void (*entrypoint)(void *ctx), // entrypoint function
+		void *ctx,     // context of the process
+		int priority,  // priority, [0 - 10], bigger for more priority
+		int deadline); // absolute time till the task should be completed, <=0 for no deadline
+
+// Continue process from function after some amount of time
+extern void sched_cont(void (*entrypoint)(void *aspace), // entrypoint function
+		void *aspace,// addresses the process can access
+		int timeout); // when the continuation became runnable
+
+// Notify scheduler that some amount of time passed
+extern void sched_time_elapsed(unsigned amount);
+
+// Scheduler loop, start executing tasks until all of them finish
+extern void sched_run(enum policy policy);
+
diff --git a/test/cosched/1.in b/test/cosched/1.in
new file mode 100644
index 0000000..db92bf7
--- /dev/null
+++ b/test/cosched/1.in
@@ -0,0 +1,5 @@
+# 	entryid	cnt	prio	deadline
+coapp	2	10	0	0
+coapp	2	10	0	0
+
+cosched 0
diff --git a/test/cosched/1.out b/test/cosched/1.out
new file mode 100644
index 0000000..2a2a491
--- /dev/null
+++ b/test/cosched/1.out
@@ -0,0 +1,22 @@
+        coapp_rt id 1 cnt 10
+        coapp_rt id 2 cnt 10
+        coapp_rt id 1 cnt 9
+        coapp_rt id 2 cnt 9
+        coapp_rt id 1 cnt 8
+        coapp_rt id 2 cnt 8
+        coapp_rt id 1 cnt 7
+        coapp_rt id 2 cnt 7
+        coapp_rt id 1 cnt 6
+        coapp_rt id 2 cnt 6
+        coapp_rt id 1 cnt 5
+        coapp_rt id 2 cnt 5
+        coapp_rt id 1 cnt 4
+        coapp_rt id 2 cnt 4
+        coapp_rt id 1 cnt 3
+        coapp_rt id 2 cnt 3
+        coapp_rt id 1 cnt 2
+        coapp_rt id 2 cnt 2
+        coapp_rt id 1 cnt 1
+        coapp_rt id 2 cnt 1
+        coapp_rt id 1 cnt 0
+        coapp_rt id 2 cnt 0
diff --git a/test/cosched/2.in b/test/cosched/2.in
new file mode 100644
index 0000000..0e021e7
--- /dev/null
+++ b/test/cosched/2.in
@@ -0,0 +1,6 @@
+# 	entryid	cnt	prio	deadline
+coapp	2	2	2	0
+coapp	2	2	0	0
+coapp	2	2	0	0
+
+cosched 1
diff --git a/test/cosched/2.out b/test/cosched/2.out
new file mode 100644
index 0000000..47a058f
--- /dev/null
+++ b/test/cosched/2.out
@@ -0,0 +1,9 @@
+        coapp_rt id 1 cnt 2
+        coapp_rt id 1 cnt 1
+        coapp_rt id 1 cnt 0
+        coapp_rt id 2 cnt 2
+        coapp_rt id 3 cnt 2
+        coapp_rt id 2 cnt 1
+        coapp_rt id 3 cnt 1
+        coapp_rt id 2 cnt 0
+        coapp_rt id 3 cnt 0
diff --git a/test/cosched/3.in b/test/cosched/3.in
new file mode 100644
index 0000000..2bf55b7
--- /dev/null
+++ b/test/cosched/3.in
@@ -0,0 +1,6 @@
+# 	entryid	cnt	prio	deadline
+coapp	2	2	0	-1
+coapp	2	2	0	2
+coapp	2	2	0	-1
+
+cosched 2
diff --git a/test/cosched/3.out b/test/cosched/3.out
new file mode 100644
index 0000000..698f213
--- /dev/null
+++ b/test/cosched/3.out
@@ -0,0 +1,9 @@
+        coapp_rt id 2 cnt 2
+        coapp_rt id 2 cnt 1
+        coapp_rt id 2 cnt 0
+        coapp_rt id 1 cnt 2
+        coapp_rt id 3 cnt 2
+        coapp_rt id 1 cnt 1
+        coapp_rt id 3 cnt 1
+        coapp_rt id 1 cnt 0
+        coapp_rt id 3 cnt 0
diff --git a/test/cosched/4.in b/test/cosched/4.in
new file mode 100644
index 0000000..2b984b5
--- /dev/null
+++ b/test/cosched/4.in
@@ -0,0 +1,5 @@
+# 	entryid	cnt	prio	deadline
+coapp	1	4	2	0
+coapp	2	16	0	0
+
+cosched 1
diff --git a/test/cosched/4.out b/test/cosched/4.out
new file mode 100644
index 0000000..b6b56cc
--- /dev/null
+++ b/test/cosched/4.out
@@ -0,0 +1,22 @@
+      coapp_task id 1 cnt 4
+        coapp_rt id 2 cnt 16
+        coapp_rt id 2 cnt 15
+      coapp_task id 1 cnt 3
+        coapp_rt id 2 cnt 14
+        coapp_rt id 2 cnt 13
+      coapp_task id 1 cnt 2
+        coapp_rt id 2 cnt 12
+        coapp_rt id 2 cnt 11
+      coapp_task id 1 cnt 1
+        coapp_rt id 2 cnt 10
+        coapp_rt id 2 cnt 9
+      coapp_task id 1 cnt 0
+        coapp_rt id 2 cnt 8
+        coapp_rt id 2 cnt 7
+        coapp_rt id 2 cnt 6
+        coapp_rt id 2 cnt 5
+        coapp_rt id 2 cnt 4
+        coapp_rt id 2 cnt 3
+        coapp_rt id 2 cnt 2
+        coapp_rt id 2 cnt 1
+        coapp_rt id 2 cnt 0
diff --git a/test/cosched/run-test.sh b/test/cosched/run-test.sh
new file mode 100755
index 0000000..145f39a
--- /dev/null
+++ b/test/cosched/run-test.sh
@@ -0,0 +1,2 @@
+
+map_inputs checkdiff